/*
 * Copyright (c) 2012-2014 The original author or authors
 * ------------------------------------------------------
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 * The Eclipse Public License is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * The Apache License v2.0 is available at
 * http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */
package org.dna.mqtt.moquette.processor.impl;

import org.dna.mqtt.moquette.messaging.spi.impl.ValueEvent;
import org.dna.mqtt.moquette.proto.messages.UnsubAckMessage;
import org.dna.mqtt.moquette.proto.messages.UnsubscribeMessage;
import org.dna.mqtt.moquette.server.Constants;
import org.dna.mqtt.moquette.server.ServerChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author puran
 */
public class UnSubscribeProcessor extends AbstractProtocolProcessor {
	private static final Logger LOG = LoggerFactory.getLogger(UnSubscribeProcessor.class);
	
	public UnSubscribeProcessor(ServerChannel session, UnsubscribeMessage message) {
		super(session, message);
	}

	@Override
	public void processEvent(ValueEvent valueEvent) {
		ServerChannel session = getSession();
		UnsubscribeMessage message = (UnsubscribeMessage)getMessage();
		
		String clientID = (String)session.getAttribute(Constants.ATTR_CLIENTID);
		
		LOG.debug("processUnsubscribe invoked, removing subscription on topics {}, for clientID <{}>", message.topics(), clientID);
        for (String topic : message.topics()) {
            getBaseProcessor().removeSubscription(topic, clientID);
        }
        
        //ack the client
        UnsubAckMessage ackMessage = new UnsubAckMessage();
        ackMessage.setMessageID(message.getMessageID());

        LOG.info("replying with UnsubAck to MSG ID {}", message.getMessageID());
        
        //TODO:move to abstract class, not sure if it has to be done here!
        session.write(ackMessage);
	}
}
